Litter box



FIG. 1 is a top perspective view of a litter box in accordance with our new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a side perspective view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a front view thereof;

FIG. 8 is a rear view thereof;

FIG. 9 is a top view thereof; and,

FIG. 10 is a bottom view thereof.

The broken lines in the drawings illustrate portions of the litter box that form no part of the claimed design. 

CLAIM The ornamental design for a litter box, as shown and described. 